Chemistry
With reference to the uses of hydrogen, give reasons for the following —
(a) Hydrogen is not used in air balloons.
(b) A mixture of hydrogen & oxygen on burning, find application in welding & cutting metals
(c) Reaction of hydrogen with nitrogen under specific conditions finds industrial utility.
Hydrogen
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Answer
(a) Hydrogen is lighter than air but it is a highly combustible gas. It forms an explosive mixture with air (due to the oxygen present in it). Hence, it is not used in air balloons.
(b) A mixture of hydrogen & oxygen on burning produces heat [temperatures upto 2800°C]. Such high temperature flames are used for welding & cutting metals.
(c) Hydrogen combines with nitrogen at 450°C and in the presence of catalyst iron to give ammonia. Ammonia is used in the manufacture of urea, fertilizers, nitric acid, explosives, etc.
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